Onimusha Boss Guide: All 18 Bosses & Carnage S-Rank

Quick Answer: How to Defeat Bosses on Carnage Difficulty

Direct Answer: Conquering bosses in Onimusha: Way of the Sword on Carnage (修罗) difficulty requires mastering Deflection Issen (弹一闪) and exploiting elemental weaknesses. On Carnage, counter windows shrink to 33ms (2 frames at 60 FPS) and bosses inflict 2.5x damage. Never spam standard attacks; instead, bait predictable combo starters, deflect on initial impact to knock back boss weapons, and immediately punish with Chain Issen (连闪) or heavy weapon arts to stagger them into Break Issen (崩一闪).

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All 18 Bosses: Complete Encounter Matrix

The table below catalogs every main boss encountered across the 10 campaign chapters, their elemental alignments, and requirements for S-Rank Rematch clears:

#	Boss Name & Japanese Title	Chapter & Location	Elemental Weakness	S-Rank Clear Time	Recommended Blade
1	Genma Vanguard Hanzuchi (先锋半槌)	Ch 1: Sanjo Bridge	Lightning	< 90s	Normal Katana / Raizan
2	Cursed Ronin Jinbei (狂刃甚平)	Ch 2: Gion Alley	Lightning	< 75s	Raizan (雷斩刀)
3	Corrupted Monk Benkei (破戒僧 弁庆)	Ch 3: Kiyomizu Balcony	Wind	< 120s	Senpu (疾风刀)
4	Drowned Maiden Mizuchi (水魑妖女)	Ch 4: Kamo Aqueducts	Fire	< 110s	Enryu (炎龙剑)
5	Nue, Thunder Chimera (雷兽 鵺)	Ch 5: Fushimi Inari	Wind / Earth	< 150s	Senpu (疾风刀)
6	Iron Colossus Daikokuten (黑铁罗汉)	Ch 5: Torii Inner Sanctum	Lightning	< 130s	Raizan (雷斩刀)
7	Lady Jorogumo (络新妇 蜘蛛女鬼)	Ch 6: Nijo Outer Keep	Fire	< 140s	Enryu (炎龙剑)
8	Siege Drake Basan (火鸟婆娑)	Ch 6: Nijo Citadel	Lightning	< 160s	Raizan (雷斩刀)
9	Ash Golem Enma-Shin (焦炭罗刹)	Ch 7: Golden Pavilion	Wind	< 120s	Senpu (疾风刀)
10	Twin Shadow Shinobi (阴阳影忍)	Ch 7: Relic Vault	Fire / AoE	< 100s	Enryu (炎龙剑)
11	Frost Demon Yuki-Onna (雪女 冰华)	Ch 8: Mt. Hiei Base	Fire	< 135s	Enryu (炎龙剑)
12	General Oda’s Shadow (织田幻影将军)	Ch 8: Cursed Summit	Lightning (Deflect)	< 140s	Raizan (雷斩刀)
13	Void Serpent Yamata-Gaki (虚界八岐)	Ch 9: Astral Threshold	Pure Light	< 180s	Raizan / Enryu
14	Sasaki Ganryu (佐佐木岩流)	Ch 9: Spirit Bridge	Stance Counter	< 150s	Senpu / Raizan
15	Corrupted Takamura (堕落策士 高村)	Ch 9: Astral Gate	Void / Fire	< 110s	Enryu (炎龙剑)
16	Genma Sovereign Nobunaga (P1)	Ch 10: Throne of Void	Lightning	< 120s	Raizan (雷斩刀)
17	Void Emperor Nobunaga (P2)	Ch 10: Obsidian Core	Purple Souls (Oni)	< 180s	Bishamonten / Enryu
18	Demon God King (True Final Boss)	Ch 10: Secret Astral Spire	Sacred Void	< 210s	Bishamonten Sword

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Tactical Deep Dive: Key Boss Strategies

1. Corrupted Monk Benkei (破戒僧 弁庆) - Chapter 3

Benkei wields an oversized iron naginata with sweeping horizontal arcs that punish ill-timed dodges.

• Attack Patterns:
  • Triple Horizontal Sweep: Two slow swipes followed by a delayed overhead cleave.
  • Shockwave Thrust: A grounded charge that creates an unblockable kinetic tremor.
• Counter Strategy: Do not roll backwards during his sweeping attack; instead, stand your ground and perform a Deflection Issen on the second swing. When he raises his naginata vertically for the overhead smash, wait for the weapon to pause at peak elevation, then tap Attack to score a clean Normal Issen.

2. Nue, Thunder Chimera (雷兽 鵺) - Chapter 5

A chimeric nightmare with the face of a monkey, limbs of a tiger, body of a tanuki, and a venomous viper for a tail.

• Attack Patterns:
  • Lightning Cascade: Calls lightning strikes that electrify water puddles across the shrine floor.
  • Tail Venom Spray: 180-degree sweep emitting a toxic cloud.
  • Forward Dive Roar: Nue leaps backwards onto a torii pillar before launching a sonic dive attack.
• Counter Strategy: Equip Senpu (Gale Dual Blades). When Nue prepares the dive from the pillar, observe its paws. The instant it pushes off the wood, trigger your counter attack. Landing this Issen grounds the beast for 6 seconds, exposing its soft underbelly to multi-hit whirlwind weapon arts.

3. General Oda’s Shadow (织田幻影将军) - Chapter 8

A spectral manifestation of Nobunaga wielding both a demonic arquebus firearm and a curved nodachi.

• Key Mechanic: Bullet Deflection:
  • Unlike melee attacks, bullets fired from Oda’s firearm cannot be blocked with standard guard.
  • You must tap Guard at the exact frame of muzzle flash. A successful parry reflects the projectile directly into Oda’s chest, staggering him for 4 seconds and granting free red souls.
• Melee Follow-up: After reflecting 2 bullets, switch to Raizan and execute Raikou-zan to electrocute him through his defensive barrier.

4. Sasaki Ganryu (佐佐木岩流) - Chapter 9

Regarded by the community as the most technically demanding duel in the game. Ganryu mirrors Musashi’s stances and possesses lightning-fast gap closers.

• Signature Move: Tsubame Gaeshi (燕返):
  • A three-hit slash that curves unpredictably through the air. Hits 1 and 3 are unblockable.
  • Parry Window: You must deflect the second upward stroke. The visual indicator is the silver crescent flash trailing his blade.
• Chain Counter: When Ganryu enters his high-stance windup (Ganryu no Kamae), he cannot dodge. Tap Attack within 33ms of his forward foot touching the floor to trigger an instant Chain Issen, stripping half his posture meter immediately.

5. Genma Sovereign Nobunaga (幻魔霸王) - Chapter 10

The two-phase finale demanding full utilization of the Oni Gauntlet.

• Phase 1 (Humanoid Duel): Nobunaga summons floating phantom blades. Use Enryu’s flame wave to melt the phantom blades before engaging in sword clashes.
• Phase 2 (Colossal Demonic Sovereign): Nobunaga encases himself in impenetrable obsidian armor. Normal weapons deal zero damage.
• The Solution: Absorb 5 Purple Souls to activate Oni Awakening (鬼武者变身). In Oni form, your strikes shatter the obsidian plating, revealing the pulsating core for a devastating Break Issen Finish.

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Carnage Difficulty (修罗) Rules of Engagement

1. Never Panic Roll: Recovery frames after a roll leave Musashi completely vulnerable. Stand firm and rely on Deflection.
2. Prioritize Kishin Shrines: Upgrade your primary blade’s level to Level 3 before Chapter 5 to unlock extended stagger durations.
3. Equip the Rosary of the Exorcist: Obtained on Floor 10 of the Dark Realm, this item draws souls automatically during combat, enabling continuous HP and MP regeneration without pausing to channel R2.

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S-Rank Rematch Rating Checklist

To achieve S-Rank across all 18 rematches in the post-game arena:

• Clear time under the benchmark listed in the encounter matrix.
• Retain at least 85% of your maximum health (damage taken <= 15%).
• Execute at least 3 successful Issen or Break Issen techniques.
• S-Rank rewards: Unlocks the Golden Demon Armor and infinite talisman charms.